Pituitous Silicone Fluids

ABSTRACT

Fluid compositions are disclosed containing a branched organopolysiloxane and a carrier fluid. The branched organopolysiloxane is obtainable by reacting an organohydrogencyclosiloxane and an alkenyl terminated polydiorganosiloxane. The disclosed fluid compositions possess pituitous rheological properties.

CROSS REFERENCE TO RELATED APPLICATIONS

This application claims the benefit of U.S. application Ser. Nos.61/239,529 and 61/239,533, as filed on 3 Sep. 2009.

TECHNICAL FIELD

This disclosure relates to fluid compositions containing a branchedorganopolysiloxane and a carrier fluid. The branched organopolysiloxaneis obtainable by reacting an organohydrogencyclosiloxane and an alkenylterminated polydiorganosiloxane. The disclosed fluid compositionspossess pituitous rheological properties.

BACKGROUND

Besides providing certain functional benefits, silicones areincorporated into personal care products for their inherent aestheticbenefits. In particular, formulators will optimize the overallaesthetics of personal care products by selecting certain types andamounts of a silicone. As such, there is a continuing need in thisindustry to discover new silicone compositions that provide improvedproduct aesthetics, sensory perceptions, or functional improvements. Thepresent inventors have discovered certain silicone fluid compositionsthat provide such improvements.

SUMMARY

This disclosure relates to a fluid composition comprising:

-   -   A) 0.1 to 50 wt % of a branched organopolysiloxane prepared by        reacting;        -   a) an organohydrogencyclosiloxane having the formula            [(CH₃)HSiO]_(g)            -   where g is 3 to 8, and,        -   b) an alkenyl terminated polydiorganosiloxane comprising            siloxy units of the formula            (R₂R²SiO_(1/2))_(v)(R₂SiO_(2/2))_(x)            -   where v≧2, and x≧50,            -   R is an alkyl group containing 1 to 6 carbon atoms,            -   R² is an alkenyl group containing 2 to 12 carbon atoms,        -   in the presence of a hydrosilylation catalyst, where the            molar ratio of alkenyl groups to SiH in the reaction is            between 0.9/1 to 2.2/1, and    -   B) 50 to 99.9 wt % of a carrier fluid,        wherein the fluid composition has a viscosity of at least 100        mPa·s (cP) at 23° C. and exhibits pituitous rheological        properties.

Pituitous fluids are fluids that display particular types of rheologicalbehavior. The most easily recognized rheological behavior for thepituitous fluids is their “stringing” behavior, which is the formationof thin strings or threads when a small amount of the pituitous fluid isseparated from the bulk of the fluid. Another rheological characteristicexhibited by pituitous fluids is that they develop a normal force whensubjected to shear stress. When a pituitous fluid is subjected to shearstress in the x-y plane, a force is developed in the z direction(perpendicular, or “normal” to the plane of shear). This behavior isrelated to a phenomenon known as the Weissenberg Effect whereby polymersin solution that are stirred tend to climb up the stirrer due toentanglements between polymer chains that develop under shear stress.Using a controlled stress rheometer, the normal force may be measured.

The pituitous silicone fluids of this disclosure are often highlylubricious yet form very persistent films on surfaces. As the pituitousfluids are sheared, the normal force developed resists thinning of thefluid and thereby maintaining a thicker lubrication layer between themoving surfaces. We have found that that certain branched and highmolecular weight silicone fluids exhibit novel sensory and film-formingproperties and these properties correlate with pituitous rheologicalbehavior.

DETAILED DESCRIPTION

This disclosure relates to a fluid composition comprising:

A) 0.1 to 50 wt % of a branched organopolysiloxane prepared by reacting;

-   -   a) an organohydrogencyclosiloxane having the formula        [(CH₃)HSiO]_(g)        -   where g is 3 to 8, and,    -   b) an alkenyl terminated polydiorganosiloxane comprising siloxy        units of the formula (R₂R²SiO_(1/2))_(v)(R₂SiO_(2/2))_(x)        -   where v≧2, and x≧50,        -   R is an alkyl group containing 1 to 6 carbon atoms,        -   R² is an alkenyl group containing 2 to 12 carbon atoms,    -   in the presence of a hydrosilylation catalyst, where the molar        ratio of alkenyl groups to SiH in the reaction is between 0.9/1        to 2.2/1, and

B) 50 to 99.9 wt % of a carrier fluid,

wherein the fluid composition has a viscosity of at least 100 mPa·s (cP)at 23° C. and exhibits pituitous rheological properties.

As used herein “fluid” means a liquid whose component particles can movepast one another, that is flow, when a force is applied such as gravity.As used herein, “fluids” do not encompass “gels”, which do not flow.

The fluid compositions of the present invention have a viscosity of atleast 100 mPa·s (cP) at 23° C., alternatively of at least 200 mPa·s (cP)at 23° C., or alternatively 300 mPa·s (cP) at 23° C.

This disclosure provides certain silicone fluid compositions havingpituitous rheological properties. As used herein, “pituitous” refers tothe rheological property of an increasing normal force (typicallymeasured in Pascals) observed in the perpendicular direction when aconstantly increasing shear (typically measured in sec⁻¹) is applied toa film or layer of the fluid. In other words, when a pituitous fluid issubjected to shear stress in the x-y plane, a force is developed in thez direction (perpendicular or normal to the plane of shear). Pituitousrheology of the present silicone fluids may be measured using acontrolled stress rheometer. Such rheometers are commercially available,such as TA Instruments AR 1000-N (109 Lukens Drive, New Castle Del.19720). The fluid is held between a flat disk (attached to therheometer) and a stationary plate equipped with a load cell. Acontrolled amount of force (torque) is applied to the shaft attached tothe disc thus subjecting the sample to a shear stress. Typically, thetorque is increased during the experiment and the disc rotates at anincreasing rate which is recorded as the shear rate. As the fluid sampleis being subjected to the shear stress, the normal force is recorded bythe load cell. The results of the evaluations of the silicone fluidrheological properties using such instruments are reported as a plot ofnormal force in Pascals vs a perpendicular shear rate in sec⁻¹.

The fluid compositions of the present disclosure possess rheologicalproperties such that when a plot of normal force in Pascal vs aperpendicular shear rate in sec⁻¹ is measured using a controlled stressrheometer as described above, the plot has an average slope that isgreater than 3.6.

A) The Branched Organopolysiloxane

The branched organopolysiloxane is obtainable by reacting;

-   -   a) an organohydrogencyclosiloxane having the formula        [(CH₃)HSiO]_(g)        -   where g is 3 to 8 and,    -   b) an alkenyl terminated polydiorganosiloxane comprising siloxy        units of the formula (R₂R²SiO_(1/2))_(v)(R₂SiO_(2/2))_(x)        -   where v≧2, and x≧50,        -   R is an alkyl group containing 1 to 6 carbon atoms,        -   R² is an alkenyl group containing 2 to 12 carbon atoms,    -   in the presence of a hydrosilylation catalyst, where the molar        ratio of alkenyl groups to SiH in the reaction is between 0.9/1        to 2.2/1.

The organohydrogencyclosiloxanes useful as component a) have the formula[(CH₃)HSiO]_(g) where g is 3 to 8, or mixtures thereof. Alternativelyorganohydrogencyclosiloxanes may be selected where g is 4 to 6, oralternatively g is 4.

Component b) is an alkenyl terminated polydiorganosiloxane. Component b)may be selected from any organopolysiloxane, or mixture oforganopolysiloxanes comprising siloxy units represented by the formula(R₂R²SiO_(1/2))_(v)(R₂SiO_(2/2))_(x) where v≧2, and x≧50, alternativelyx≧100, R is a hydrocarbon or halogen substituted hydrocarbon containing1 to 20 carbons, alternatively an alkyl group containing 1 to 12carbons, alternatively an alkyl group containing 1 to 6 carbons oralternatively methyl. The monovalent hydrocarbon group R having from 1to 20 carbon atoms is exemplified by alkyl groups such as: methyl,ethyl, propyl, butyl, hexyl, octyl, and decyl; cycloaliphatic groupssuch as cyclohexyl; aryl groups such as phenyl, tolyl, and xylyl; andaralkyl groups such as benzyl and phenylethyl. R² is an alkenyl groupcontaining 2 to 12 carbon atoms. The R² alkenyl groups of component b)are exemplified by vinyl, allyl, 3-butenyl, 4-pentenyl, 5-hexenyl,6-heptenyl, 7-octenyl, 8-nonenyl, 9-decenyl, 10-undecenyl,4,7-octadienyl, 5,8-nonadienyl, 5,9-decadienyl, 6,11-dodecadienyl and4,8-nonadienyl.

The polydiorganosiloxane can be a homopolymer, a copolymer or aterpolymer containing such organic groups. Examples include copolymerscomprising dimethylsiloxy units and phenylmethylsiloxy units, copolymerscomprising dimethylsiloxy units and 3,3,3-trifluoropropylmethylsiloxyunits, copolymers of dimethylsiloxy units and diphenylsiloxy units andinterpolymers of dimethylsiloxy units, diphenylsiloxy units andphenylmethylsiloxy units, among others. The molecular structure is alsonot critical and is exemplified by straight-chain and partially branchedstraight-chain structures, the linear systems being the most typical.

The alkenyl terminated polydiorganosiloxane may also contain othersiloxy units, such as “T” units (RSiO_(3/2)) and “Q” siloxy units(SiO_(4/2)).

Component b) may also be a mixture of any of the aforementionedorganopolysiloxanes. The molecular weights, or the degree ofpolymerization (as designated by subscript (x) may vary providing x isgreater than or equal to 50, otherwise the molecular weights are notlimiting. However, when molecular weights become too high or if theorganopolysiloxane is a solid, it may be desirable to dilute componentb) in a suitable solvent or lower molecular weight fluid, such as any ofthe carrier fluids described below.

Component b) may be selected from vinyl functional endblockedpolydimethylsiloxanes (vinyl siloxanes) or hexenyl functional endblockedpolydimethylsiloxanes (hexenyl siloxanes), such as those having theaverage formula;

CH₂═CH(Me)₂SiO[Me₂SiO]_(x′)Si(Me)₂CH═CH₂CH₂═CH—(CH₂)₄—(Me)₂SiO[Me₂SiO]_(x′)Si(Me)₂—(CH₂)₄—CH═CH₂

-   -   wherein Me is methyl,    -   x′≧50.

Vinyl or hexenyl functional polydimethylsiloxanes are known, and thereare many commercially available. Representative, non-limiting examplesinclude DOW CORNING® fluids; SFD 128, DC4-2764, DC2-7891, DC2-7754,DC2-7891, and DC 2-7463, SFD-117, SFD-119, SFD 120, SFD 129, DC 5-8709,LV, 2-7038, DC 2-7892, 2-7287, 2-7463, and dihexenyl terminal DC7692,DC7697 (Dow Corning Corporation, Midland, Mich.).

In one embodiment, the alkenyl terminated polydiorganosiloxane isselected from a polydiorganosiloxane gum. As used herein,polydiorganosiloxane gums are organopolysiloxanes comprisingpredominately D siloxy units and are of sufficient molecular weight toimpart pituitous behavior to the silicone fluid compositions.Alternatively, the polydiorganosiloxane gum is of sufficient molecularweight to impart a viscosity of at least 1,000,000 mm²/s at 25° C., oralternatively 2,000,000 mm²/s at 25° C. Alternatively, the molecularweight of the diorganopolysiloxane gum is sufficient to impart aWilliams plasticity number of at least 40 as determined by the AmericanSociety for Testing and Materials (ASTM) test method 926. Typically, theplasticity number should be 40 to 200, or alternatively 50 to 150.Alternatively, the molecular weight of the diorganopolysiloxane gum isat least 600,000 Daltons, or alternatively at least 1,000,000 Daltons,or alternatively at least 2,000,000 Daltons.

The silicon-bonded organic groups of the diorganopolysiloxane may beindependently selected from hydrocarbon, or halogenated hydrocarbongroups. The hydrocarbon groups may be specifically exemplified by alkylgroups having 1 to 20 carbon atoms, such as methyl, ethyl, propyl,butyl, pentyl and hexyl; cycloalkyl groups, such as cyclohexyl andcycloheptyl; aryl groups having 6 to 12 carbon atoms, such as phenyl,tolyl and xylyl; aralkyl groups having 7 to 20 carbon atoms, such asbenzyl and phenylethyl. The hydrocarbon group may also be an alkenylgroup having 2 to 20 carbon atoms exemplified by vinyl, allyl, butenyl,pentenyl, hexenyl and decenyl, preferably vinyl or hexenyl groups. Thehalogenated alkyl groups may have 1 to 20 carbon atoms, such as3,3,3-trifluoropropyl and chloromethyl.

Specific illustrations of diorganopolysiloxane gums include:dimethylvinylsiloxy-endblocked dimethylpolysiloxanes;dimethylvinylsiloxy-endblocked dimethylsiloxane-methylvinylsiloxanecopolymers; dimethylvinylsiloxy-endblocked methylphenylpolysiloxanes;dimethylvinylsiloxy-endblockedmethylphenylsiloxane-dimethylsiloxane-methylvinylsiloxane copolymers;and similar copolymers wherein at least one end group contains a vinylgroup.

Methods for preparing diorganopolysiloxane gums are well known and manyare commercially available. Representative commercial products suitablein the present silicone compositions include; Dow Corning® SGM-36 Gumand SGM-3 Gum.

The reaction between components a) and b) is conducted in the presenceof a hydrosilylation catalyst. It is preferred to use platinum groupmetal-containing catalysts. By platinum group it is meant ruthenium,rhodium, palladium, osmium, iridium and platinum and complexes thereof.Platinum group metal-containing catalysts useful in preparing thecompositions of the present invention are the platinum complexesprepared as described by Willing, U.S. Pat. No. 3,419,593, and Brown etal, U.S. Pat. No. 5,175,325, each of which is hereby incorporated byreference to show such complexes and their preparation. Other examplesof useful platinum group metal-containing catalysts can be found in Leeet al., U.S. Pat. No. 3,989,668; Chang et al., U.S. Pat. No. 5,036,117;Ashby, U.S. Pat. No. 3,159,601; Lamoreaux, U.S. Pat. No. 3,220,972;Chalk et al., U.S. Pat. No. 3,296,291; Modic, U.S. Pat. No. 3,516,946;Karstedt, U.S. Pat. No. 3,814,730; and Chandra et al., U.S. Pat. No.3,928,629 all of which are hereby incorporated by reference to showuseful platinum group metal-containing catalysts and methods for theirpreparation. The platinum-containing catalyst can be platinum metal,platinum metal deposited on a carrier such as silica gel or powderedcharcoal, or a compound or complex of a platinum group metal. Preferredplatinum-containing catalysts include chloroplatinic acid, either inhexahydrate form or anhydrous form, and or a platinum-containingcatalyst which is obtained by a method comprising reactingchloroplatinic acid with an aliphatically unsaturated organosiliconcompound such as divinyltetramethyldisiloxane, or alkene-platinum-silylcomplexes as described in U.S. patent application Ser. No. 10/017229,filed Dec. 7, 2001, such as (COD)Pt(SiMeCl₂)₂, where COD is1,5-cyclooctadiene and Me is methyl. These alkene-platinum-silylcomplexes may be prepared, for example by mixing 0.015 mole (COD)PtCl₂with 0.045 mole COD and 0.0612 moles HMeSiCl₂.

The appropriate amount of the catalyst will depend upon the particularcatalyst used. The platinum catalyst should be present in an amountsufficient to provide at least 2 parts per million (ppm), preferably 4to 200 ppm of platinum based on total weight percent solids (allnon-solvent ingredients) in the composition. It is highly preferred thatthe platinum is present in an amount sufficient to provide 4 to 150weight ppm of platinum on the same basis. The catalyst may be added as asingle species or as a mixture of two or more different species.

The hydrosilylation reaction between components a) and b) is conductedsuch that the molar ratio of the total alkenyl groups present in thehydrosilylation reaction to the SiH units (% H) in component a) isbetween 0.9/1 to 2.2/1.

The hydrosilylation reaction between components a) and b) may beconducted neat, or in the presence of a suitable solvent. Typically, thehydrosilylation reaction solvent is selected from one of the carrierfluids as described below as component B).

B) The Carrier Fluid

The organopolysiloxanes as described above are dispersed in a carrierfluid. Suitable carrier fluids include silicones, both linear andcyclic, organic oils, organic solvents and mixtures of these. Specificexamples of solvents may be found in U.S. Pat. No. 6,200,581, which ishereby incorporated by reference for this purpose.

Typically, the carrier fluid is a low viscosity silicone or a volatilemethyl siloxane or a volatile ethyl siloxane or a volatile methyl ethylsiloxane having a viscosity at 25° C. in the range of 1 to 1,000 mm²/secsuch as hexamethylcyclotrisiloxane, octamethylcyclotetrasiloxane,decamethylcyclopentasiloxane, dodecamethylcyclohexasiloxane,octamethyltrisiloxane, decamethyltetrasiloxane,dodecamethylpentasiloxane, tetradecamethylhexasiloxane,hexadeamethylheptasiloxane,heptamethyl-3-{(trimethylsilyl)oxy)}trisiloxane,hexamethyl-3,3,bis{(trimethylsilyl)oxy}trisiloxanepentamethyl{(trimethylsilyl)oxy}cyclotrisiloxane as well aspolydimethylsiloxanes, polyethylsiloxanes, polymethylethylsiloxanes,polymethylphenylsiloxanes, polydiphenylsiloxanes.

Organic solvents may be exemplified by, but not limited to, aromatichydrocarbons, aliphatic hydrocarbons, alcohols, aldehydes, ketones,amines, esters, ethers, glycols, glycol ethers, alkyl halides andaromatic halides. Hydrocarbons including isododecane, isohexadecane,Isopar L (C11-C13), Isopar H (C11-C12), hydrogentated polydecene. Ethersand esters including isodecyl neopentanoate, neopentylglycol heptanoate,glycol distearate, dicaprylyl carbonate, diethylhexyl carbonate,propylene glycol n butyl ether, ethyl-3 ethoxypropionate, propyleneglycol methyl ether acetate, tridecyl neopentanoate, propylene glycolmethylether acetate (PGMEA), propylene glycol methylether (PGME),octyldodecyl neopentanoate, diisobutyl adipate, diisopropyl adipate,propylene glycol dicaprylate/dicaprate, and octyl palmitate. Additionalorganic carrier fluids suitable as a stand alone compound or as aningredient to the carrier fluid include fats, oils, fatty acids, andfatty alcohols.

The amount of carrier fluid is such that there is 50 to 99.9 weightpercent, alternatively 80 to 99.9 weight percent, alternatively 90 to99.9 weight percent, of carrier fluid in the fluid composition.

The present fluid compositions may be prepared by simply combiningcomponents A) and B) and mixing. Typically however, it is moreconvenient to conduct the hydrosilylation reaction between components a)and b) to form component A) in the selected carrier fluid (componentB)).

The pituitous silicone fluids compositions, or emulsions thereof, may beformulated into personal care products. The personal care compositionsmay be in the form of a cream, a gel, a powder, a paste, or a freelypourable liquid. Generally, such compositions can generally be preparedat room temperature if no solid materials at room temperature arepresents in the compositions, using simple propeller mixers, Brookfieldcounter-rotating mixers, or homogenizing mixers. No special equipment orprocessing conditions are typically required. Depending on the type ofform made, the method of preparation will be different, but such methodsare well known in the art.

The personal care products may be functional with respect to the portionof the body to which they are applied, cosmetic, therapeutic, or somecombination thereof. Conventional examples of such products include, butare not limited to: antiperspirants and deodorants, skin care creams,skin care lotions, moisturizers, facial treatments such as acne orwrinkle removers, personal and facial cleansers, bath oils, perfumes,colognes, sachets, sunscreens, pre-shave and after-shave lotions,shaving soaps, and shaving lathers, hair shampoos, hair conditioners,hair colorants, hair relaxants, hair sprays, mousses, gels, permanents,depilatories, and cuticle coats, make-ups, color cosmetics, foundations,concealers, blushes, lipsticks, eyeliners, mascara, oil removers, colorcosmetic removers, and powders, medicament creams, pastes or spraysincluding antiacne, dental hygienic, antibiotic, healing promotive,nutritive and the like, which may be preventative and/or therapeutic. Ingeneral the personal care products may be formulated with a carrier thatpermits application in any conventional form, including but not limitedto liquids, rinses, lotions, creams, pastes, gels, foams, mousses,ointments, sprays, aerosols, soaps, sticks, soft solids, solid gels, andgels. What constitutes a suitable carrier is readily apparent to one ofordinary skill in the art.

The present compositions can be used in a variety of personal,household, and healthcare applications. In particular, the compositionsof the present invention may be used in the personal care products astaught in U.S. Pat. Nos. 6,051,216, 5,919,441, 5,981,680; as disclosedin WO 2004/060271 and WO 2004/060101; in sunscreen compositions astaught in WO 2004/060276; in cosmetic compositions also containingfilm-forming resins, as disclosed in WO 03/105801; in the cosmeticcompositions as taught in US Patent Application Publications2003/0235553, 2003/0072730, 2003/0170188, EP 1,266,647, EP 1,266,648,EP1,266,653, WO 03/105789, WO 2004/000247 and WO 03/106614; asadditional agents to those taught in WO 2004/054523; in long wearingcosmetic compositions as taught in US Patent Application Publication2004/0180032; in transparent or translucent care and/or make upcompositions as discussed in WO 2004/054524; all of which areincorporated herein by reference.

EXAMPLES

These examples are intended to illustrate the invention to one ofordinary skill in the art and should not be interpreted as limiting thescope of the invention set forth in the claims. All measurements andexperiments were conducted at 23° C., unless indicated otherwise.

Example 1

A series of pituitous silicone fluids were prepared by reactingvinyl-terminated dimethyl siloxane polymers with methylhydrogen cyclicsiloxanes to produce highly branched fluids. In these examples, thestoichiometry of the reaction was controlled so as to produce a highlybranched network but yet still below the gel point (the point where thenumber interconnections between siloxane chains are numerous enough toproduce an elastomeric solid). The reaction vessel was charged with thedimethylvinyl-terminated dimethylsiloxane polymer (A) with an averagedegree of polymerization of ˜4800 and a % vinyl level of ˜150 ppm (C₂H₃)dispersed in Isopar™L diluent. To this was added thetetramethylcyclotetrasiloxane (B) followed by platinum catalyst (C)diluted in dimethylvinyl-terminated dimethylsiloxane with a % vinyllevel of 2.2% (C₂H₃). The reaction mixture was then heated to 85° C. for18 hours resulting in a significant viscosity increase. The reactionmixture was then allowed to cool and poured from the reaction vessel.The table below summarizes the reactants and amounts used for examples 1A, B, C, D, and E.

Patent grams milli- Wt. Ratio Product Example grams of grams g of A/mggrams Viscosity # of A Diluent of B of B of C (cP)^(a) 1A 2.00 38.171.39 1.44 0.015 64 1B 2.00 38.17 1.50 1.33 0.015 200 1C 2.00 38.17 1.611.25 0.015 460 1D 25.00 477.12 20.21 1.24 0.19 1200 1E 2.00 38.17 1.671.20 0.015 10000 ^(a)Measured on Brookfield model RVDV-II+ viscometer,LV spindle # 2 at 20 rpm.

FIG. 1 displays a plot of the Normal Stress (Pa) vs Shear Rate (1/sec)for the silicone fluid compositions of this Example using the controlledstress rheometer, as detailed above.

Example 2

A reaction vessel was charged with the dimethylvinyl-terminateddimethylsiloxane polymer with an average degree of polymerization of˜160 (A) dispersed in toluene diluent. To this was added thetetramethylcyclotetrasiloxane (B) and the platinum catalyst. Thereaction mixture was then heated to 100° C. for 3.5 hours resulting in asignificant viscosity increase. At this raw material ratio, the vinylfunctionality is in excess resulting in the complete reaction of the SiHfunctionality. The reaction mixture was then allowed to cool and pouredfrom the reaction vessel. The table below summarizes the reactants andamounts used for this example.

Vi:SiH Product Patent grams grams of grams Molar grams Viscosity Example# of A Diluent of B Ratio of C (cP)^(a) 2A 50.00 117.3 0.260 2.02 0.161190 2B 50.00 117.3 0.265 1.98 0.161 306 2C 50.00 117.3 0.268 1.96 0.161500 ^(a)Measured on Brookfield model RVDV-II+ viscometer, spindle # 6 at100 rpm.

FIG. 2 displays a plot of the Normal Stress (Pa) vs Shear Rate (1/sec)for the silicone fluid compositions of this Example using the controlledstress rheometer, as detailed above.

1. A fluid composition comprising: A) 0.1 to 50 wt % of a branchedorganopolysiloxane prepared by reacting; a) anorganohydrogencyclosiloxane having the formula [(CH₃)HSiO]_(g) where gis 3 to 8, and, b) an alkenyl terminated polydiorganosiloxane comprisingsiloxy units of the formula (R₂R²SiO_(1/2))_(v)(R₂SiO_(2/2))_(x) wherev≧2, and x≧50, R is an alkyl group containing 1 to 6 carbon atoms, R² isan alkenyl group containing 2 to 12 carbon atoms, in the presence of ahydrosilylation catalyst, where the molar ratio of alkenyl groups to SiHin the reaction is between 0.9/1 to 2.2/1, and B) 50 to 99.9 wt % of acarrier fluid, wherein the fluid composition has a viscosity of at least100 mPa·s at 23° C. and exhibits pituitous rheological properties. 2.The fluid composition of claim 1 wherein the rheological properties ofthe fluid are determined from a plot of normal force in Pascals vs aperpendicular shear rate in sec⁻¹ wherein the plot has an average slopethat is greater than 3.6.
 3. The fluid composition of claim 1 where thealkenyl terminated polydiorganosiloxane is a vinyl terminatedpolydimethylsiloxane.
 4. The fluid composition of claim 3 wherein thevinyl terminated polydimethylsiloxane is a gum.
 5. The fluid compositionof any of the above claims where g is
 4. 6. The fluid composition ofclaim 1 where the carrier fluid is a hydrocarbon solvent.
 7. The fluidcomposition of claim 1 consisting of; A) 0.1 to 50 wt % of a branchedorganopolysiloxane prepared by reacting; a) anorganohydrogencyclosiloxane having the formula [(CH₃)HSiO]_(g) where gis 3 to 8, and, b) an alkenyl terminated polydiorganosiloxane comprisingsiloxy units the formula (R₂R²SiO_(1/2))_(v)(R₂SiO_(2/2))_(x) where v≧2,and x≧50, R is an alkyl group containing 1 to 20 carbon atoms, R² is analkenyl group containing 2 to 12 carbon atoms, in the presence of ahydrosilylation catalyst, where the molar ratio of alkenyl groups to SiHin the reaction is between 0.9/1 to 2.2/1, and B) 50 to 99.9 wt % of acarrier fluid, where g is 4, the alkenyl terminated polydiorganosiloxaneis a vinyl terminated polydimethylsiloxane.
 8. A personal carecomposition comprising the fluid composition according to claim 1.